待我长发及腰我给你一剪刀
[dài wŏ zhăng fā jí yāo wŏ jĭ nĭ yī jiăn dāo]
A humorous and somewhat sarcastic expression that literally translates to 'When my hair grows down to my waist, I'll cut it off with scissors.' It implies impatience or frustration with waiting for something or someone, especially when romantic promises are made but not kept.